Unit 7 Contents

10. Ana's older brother, Felipe, is hanging a clothesline to dry towels. He wants to hang three lines at different heights between two trees. He measures the distance between the trees to be about 17 feet and plans to tie the ropes to the trees. How much rope would you tell Felipe to get to put up the three clothelines? Explain your answer.
11. Ana's parents ask the children to help put up the tent. Ana looked at her watch when they began. It was 2:06. They finish setting up the tent at 2:52. How long did it take them to set up the tent?

Camping Adventures

Show your thinking for each problem you solve. On your paper, circle the problems for which you chose estimation as the most efficient strategy.

Ana, who is 10 years old, is camping with her 12-year-old brother Felipe, her 5-year-old sister Dalia, and her parents.

12. One evening, Ana and her family eat dinner at a restaurant in a nearby town. The restaurant had an “all-you-can-eat” fish dinner. The cost is $7.00 for adults, $5.00 for children ages 6–11, and $2.50 for children ages 3–5. If the whole family orders the fish dinner, how much will the total bill be?

Ana's 11-year-old cousin Roberto, his mother, and his little sister Angela come to the park on Friday. The families decide to go canoeing together. It costs $8.00 to rent a canoe for 1 hour. Each canoe holds 3 people.

13. Every person who is in a boat needs a life jacket. How many adult life jackets do they need? (Adults are ages 12 and up.) How many children's life jackets do they need?
14. How many canoes will they need to rent? There must be at least one adult in every canoe. (Adults are ages 12 and up.) They don't want to spend more money on rental than they have to. Draw a picture of how Ana's and Roberto's families can seat themselves in the canoes.